<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>大小</title>
		<style type="text/css">
			div input{
				width: 40px;
				font-size: 20px;
			}
			div{
				height: 500px;
				width: 400px;
				border: 2px solid red;
			}
			p a{
				height: 500px;
				width: 600px;
				border: 1px solid red;
			}
			p img{
				height: 200px;
				width: 400px;
			}
			#b{
				height: 140px;
				width: 500px;
			}
		</style>
	</head>
	<body>
		<p>
			<button id="b" type="submit">按钮</button>
		</p>
		<p>
			<img src="../img/banner2.jpg"/>
		</p>
		<p>
			<a href="#">taobao</a>
		</p>
		<div>
			<input type="text" placeholder="用户名" name="wq"/>
		</div>
		<div>22222</div>
	</body>
</html>